#!/bin/python

import sys


n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
# your code goes here
a.sort()
minimum = None
for i in range(1, len(a)):
    if minimum is None or abs(a[i] - a[i-1]) < minimum:
        minimum = abs(a[i] - a[i-1])
print minimum